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  • Nano-scale wear of hard materials: an overview
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2020-01-18
    R. Colaço; A.P. Serro

    Wear of nano/microelectromechanical systems (NEMS/MEMS) involves a limited number of superficial atomic layers. In larger components, where tolerances and surface roughness are usually quite small, wear also occurs essentially in a narrow near-surface region, with no more than few hundreds nanometers. Therefore, in general, macromechanical approaches to wear are not strictly applicable. In spite of the increasing effort, which has been made in the last two decades in this research field, there is still an evident gap between the approach of physicists to atomic wear phenomena and that of materials and mechanical engineers to micro and mesoscale wear. This paper presents an overview on the actual knowledge of the fundamentals of hard materials wear mechanisms, focused in the phenomenology that occurs from the atomic scales up to the scale of some tens of nanometers, aiming to contribute to bridge this gap of comprehension involving the wear at nanometric scales.

  • The use of surfactants in the cleaning of works of art
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2020-01-17
    David Chelazzi; Romain Bordes; Rodorico Giorgi; Krister Holmberg; Piero Baglioni
  • The importance of force in microbial cell adhesion
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2020-01-12
    Sofiane El-Kirat-Chatel; Audrey Beaussart; Marion Mathelié-Guinlet; Yves F. Dufrêne

    Microbes have evolved sophisticated strategies to colonize biotic and abiotic surfaces. Forces play a central role in microbial cell adhesion processes, yet until recently these were not accessible to study at the molecular scale. Unlike traditional assays, atomic force microscopy (AFM) is capable to study forces in single cell surface molecules and appendages, in their biologically-relevant conformation and environment. Recent AFM investigations have demonstrated that bacterial pili exhibit a variety of mechanical responses upon contact with surfaces and that cell surface adhesion proteins behave as force-sensitive switches, two phenomena that play critical roles in cell adhesion and biofilm formation. AFM has also enabled to assess the efficiency of sugars, peptides and antibodies in blocking cell adhesion, opening up new avenues for the development of antiadhesion therapies against pathogens.

  • 更新日期:2020-01-07
  • Water-in-Salt Electrolytes: An Interfacial Perspective
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2020-01-07
    Ming Chen; Guang Feng; Rui Qiao

    Liquid electrolytes with high ionic conductivity, high transference number for the target ions, and excellent electrochemical, chemical, and thermal stability are essential for electrochemical energy storage devices. Water-in-salt (WIS) electrolytes, in which the salt-water ratio is larger than one, are gaining intensive attention in the electrochemical community. Here, we review the recent work on WIS and the closely-related water-in-ionic liquids electrolytes. We highlight the fact that many properties of these electrolytes, in bulk and at electrolyte-electrode interfaces, are underpinned by the physics and chemistry of the interfaces formed between water and ions (or aggregated water/ion clusters). Manipulating these interfaces by tailoring the selection of ions and water-ion ratio opens up new dimensions in the optimization of liquid electrolytes but also poses new challenges. We conclude the review by highlighting several directions for research on WIS electrolytes, in particular, the study of WIS electrolyte-electrode interfaces using surface force measurements.

  • 更新日期:2020-01-01
  • Rational design, properties and applications of biosurfactants: a short review of recent advances
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2019-12-28
    Kang Liu; Yawei Sun; Meiwen Cao; Jiqian Wang; Jian R. Lu; Hai Xu

    Biosurfactants combine physicochemical properties with biological activities. Whilst biosurfactants are often expressed by microorganisms, an increasing amount is produced by chemical synthesis. As many exist in the form of homologous compounds, it is often difficult to purify biosurfactants. But this has not limited the efforts to develop their commercial applications. In this short review, we have featured the recent advances in three important types of biosurfactants, lipopeptides, nucleolipids and glycolipids. We have focused on comparing some of the key properties and functionalities between modern synthetic versions and their corresponding natural counterparts. We end the review by outlining the needs for not only strengthening their basic structure-property relationships through further research but also developing better technologies, irrespective of direct chemical synthesis or biological synthesis of biosurfactants through constructions of genetically engineered strains, to help advance the commercial use of biosurfactants.

  • 更新日期:2019-12-27
  • Role of Molecular Architecture in the Modulation of Hydrophobic Interactions
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2019-12-26
    Lei Xie; Diling Yang; Qiuyi Lu; Hao Zhang; Hongbo Zeng

    Hydrophobic interactions are ubiquitous in water-based systems, which play a central role in a variety of interfacial phenomena. Herein, the recent advances in the quantitative measurements of hydrophobic interactions at different solid/water, air/water and oil/water interfaces using surface forces apparatus (SFA) and atomic force microscope (AFM) are summarized. By the quantitative force measurements, the correlations among molecular architectures, hydrophobic interactions and interfacial processes associated with the stimuli-responsive materials could be established. The nanoscale chemical heterogeneity (viz., immobilized ions in close proximity to nonpolar domains) could substantially affect and even eliminate the hydrophobic interaction. Regarding the molecular order, the ordered crystalline-like hydrophobic surfaces exhibit stronger hydrophobic attraction compared to the disordered liquid-like hydrophobic surfaces due to the distinct water structure effects.

  • Non-specific interactions in biomedical applications
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2019-12-20
    Vahid Adibnia; Marziye Mirbagheri; Sina Salimi; Gregory De Crescenzo; Xavier Banquy
  • 更新日期:2019-12-20
  • Surface Forces and Friction Tuned by Thermo-Responsive Polymer Films
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2019-12-19
    Saeed Zajforoushan Moghaddam; Esben Thormann
  • Recent advances in assemblies of cyclodextrins and amphiphiles: construction and regulation
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2019-12-12
    Kaerdun Liu; Cheng Ma; Tongyue Wu; Weilin Qi; Yun Yan; Jianbin Huang
  • Forces at superhydrophobic and superamphiphobic surfaces
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2019-12-10
    Mimmi Eriksson, Agne Swerin
  • Bio-inspired Synthetic Wet Adhesives: from Permanent Bonding to Reversible Regulation
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2019-12-10
    Shuanhong Ma, Yang Wu, Feng Zhou

    Nowadays, robust underwater adhesives products are highly demanded both in industrial and biomedical field. Meanwhile, study of the underwater adhesion mechanism of natural organisms under fluid environment is necessary, which provides inspiration for engineering adhesive materials that can be used in wet environment. Scientists are committed to discovering the unique adhesion mechanisms of proteins adhesives for natural organisms. Especially, recent understanding of wet adhesion mechanisms provides designable inspiration for developing novel synthetic underwater adhesives with high performance by employing Dopa-based and coacervate-enabled strategies. Although pursuing robust interface bonding in these years, controlling the wet adhesion state with reversible/switchable feature is the latest goal for developing intelligent biomimetic adhesives, which implies important applications in multiple fields.

  • Surface Forces between Bottle-Brush Polymer Layers
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2019-12-06
    Xiaoyan Liu

    In this review, I summarize recent experimental investigations of surface and friction forces between bottle-brush structure macromolecules including biolubricants and biomimetic ones by direct force measurements. I also discuss recent experimental investigations of synergy in lubrication in which a question, “How do lubricants act together?”, is aimed to be answered. Lastly, challenges and opportunities for developing efficient lubricating systems are outlined.

  • 更新日期:2019-12-07
  • 更新日期:2019-11-18
  • Entropy Studies in Interface Science: an Ageless Tool
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2019-11-15
    Louise Deschênes, Johannes Lyklema

    It is possible to obtain (excess) interfacial entropies from the temperature dependence of some characteristic surface parameter. Such excess entropies contain much valuable information. Their studies lead to deeper insight into the interfacial properties. In some cases, quite unexpected results are obtained. In the present paper, we shall consider three illustrations: (1) the surface excess entropy of the electrical double layer on silver iodide, (2) the surface excess entropy of the interface between air and electrolyte solutions and (3) the surface excess entropy of Langmuir polymeric monolayers. Their analysis starts with defining this characteristic parameter and measuring its temperature dependence, followed by a brief thermodynamic analysis to obtain the sought entropy. Given the generality of this methodology, its applicability is likely to be extended to a variety of other interfacial properties, in particular when competition between electric and non-electric forces plays a role as in self-assembly, hydrophobic bonding and polyelectrolytes.

  • Integrating ultrafast and stochastic dynamics studies of Brownian motion in molecular systems and colloidal particles
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2019-11-14
    Guilherme H. Oliveira, Rene A. Nome

    Ultrafast spectroscopy and stochastic dynamics studies of chemical dynamics in solution with high resolution in both space and time have been undertaken for many years, but it is still challenging to connect fundamental knowledge obtained from stroboscopic approaches at ultrashort timescales and small length scales with that obtained by directly measuring individual particle motion at longer timescales. Therefore, it is interesting, conceptually and experimentally, to understand the similarities and differences between these two approaches to the study of chemical dynamics in condensed phase systems. We discuss recent advances in the understanding of the transition from ballistic to diffusive motion and chemical reaction rate theories and describe the significance of the findings in relation to the study of thermally activated processes at multiple time and length scales.

  • Foam in pharmaceutical and medical applications
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2019-11-14
    Maryam Parsa, Anna Trybala, Danish Malik, Victor Starov
  • Supramolecular Surfactants Derived from Calixarenes
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2019-11-14
    L. García-Rio, Nuno Basilio
  • The role of surface forces in mineral flotation
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2019-11-14
    Yaowen Xing, Mengdi Xu, Xiahui Gui, Yijun Cao, Martin Rudolph, Hans-Jürgen Butt, Michael Kappl

    Flotation is an interfacial separation technique, which plays a major role in mineral processing industry. It separates particles according to their wetting properties. In flotation pulp, particles and bubbles are highly dispersed in aqueous medium and in the presence of various flotation reagents. Almost all interfacial interactions including inter-particle, inter-bubble, and bubble-particle interactions in the complex pulp medium are driven by surface forces. Therefore, a fundamental understanding of the role of surface forces in flotation is a prerequisite to enhance practical flotation performance and adapt it for treatment of complex and refractory ores. In this paper, recent advances in the field of surface forces encountered in mineral flotation are reviewed. In particular, we highlight the latest progress in the attachment mechanism between bubble and particle with the aid of atomic force microscope and interference microscope. The current knowledge gap and future directions are also discussed.

  • Latin America as fertile ground for advances in Physical Organic Chemistry. The contribution of Professor Faruk Jose Nome Aguilera
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2019-11-12
    Anthony J. Kirby

    It is my sad duty to put together a few words in appreciation of my close friend and esteemed scientific colleague Faruk Nome. Who died on 24.09.2018. He stands high in the list of the most productive and talented physical organic chemists of the last hundred years.

  • 更新日期:2019-11-11
  • Progress in NMR studies of surfactant systems
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2019-11-06
    Xingcen Liu, Qun Yu, Aixin Song, Shuli Dong, Jingcheng Hao
  • Evidence for water structuring forces between surfaces.
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2011-11-30
    Christopher Stanley,Donald C Rau

    Structured water on apposing surfaces can generate significant energies due to reorganization and displacement of water as the surfaces encounter each other. Force measurements on a multitude of biological structures using the osmotic stress technique have elucidated commonalities that point toward an underlying hydration force. In this review, the forces of two contrasting systems are considered in detail: highly charged DNA and nonpolar, uncharged hydroxypropyl cellulose. Conditions for both net repulsion and attraction, along with the measured exclusion of chemically different solutes from these macromolecular surfaces, are explored and demonstrate common features consistent with a hydration force origin. Specifically, the observed interaction forces can be reduced to the effects of perturbing structured surface water.

  • Novel Methods of Enhanced Retention in and Rapid, Targeted Release from Liposomes.
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2011-05-24
    Joseph A Zasadzinski,Benjamin Wong,Natalie Forbes,Gary Braun,Guohui Wu

    Liposomes are single bilayer capsules with distinct interior compartments in which hydrophilic drugs, imaging agents, diagnostics, etc. can be sequestered from the exterior environment. The polar parts of the individual lipids face the water compartments, while the hydrophobic parts of the lipid provide a barrier in which hydrophilic or charged molecules are poorly soluble. Hydrophobic molecules can be dissolved within the bilayer. The bilayers are typically from 3 - 6 nm thick and the liposome can range from about 50 nm - 50 microns in diameter. The question asked in this review is if any one bilayer, regardless of its composition, can provide the extended drug retention, long lifetime in the circulation, active targeting to specific tissues and rapid and controllable drug release at the site of interest. As an alternative, we review methods of self-assembling multicompartment lipid structures that provide enhanced drug retention in physiological environments. We also review methods of externally targeting and triggering drug release via the near infrared heating of gold nanoshells attached to or encapsulated within bilayer vesicles.

  • Targeted Nanocarriers for Imaging and Therapy of Vascular Inflammation.
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2011-06-29
    Ann-Marie Chacko,Elizabeth D Hood,Blaine J Zern,Vladimir R Muzykantov

    Vascular inflammation is a common, complex mechanism involved in pathogenesis of a plethora of disease conditions including ischemia-reperfusion, atherosclerosis, restenosis and stroke. Specific targeting of imaging probes and drugs to endothelial cells in inflammation sites holds promise to improve management of these conditions. Nanocarriers of diverse compositions and geometries, targeted with ligands to endothelial adhesion molecules exposed in inflammation foci are devised for this goal. Imaging modalities that employ these nanoparticle probes include radioisotope imaging, MRI and ultrasound that are translatable from animal to human studies, as well as optical imaging modalities that at the present time are more confined to animal studies. Therapeutic cargoes for these drug delivery systems include diverse anti-inflammatory agents, anti-proliferative drugs for prevention of restenosis, and antioxidants. This article reviews recent advances in the area of image-guided translation of targeted nanocarrier diagnostics and therapeutics in nanomedicine.

  • Computational protein design: Advances in the design and redesign of biomolecular nanostructures.
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2011-05-06
    Jeffery G Saven

    Computational protein design facilitates the continued development of methods for the design of biomolecular structure, sequence and function. Recent applications include the design of novel protein sequences and structures, proteins incorporating nonbiological components, protein assemblies, soluble variants of membrane proteins, and proteins that modulate membrane function.

  • Hydrogel microparticles from lithographic processes: novel materials for fundamental and applied colloid science.
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2011-04-26
    Matthew E Helgeson,Stephen C Chapin,Patrick S Doyle

    In recent years there has been a surge in methods to synthesize geometrically and chemically complex microparticles. Analogous to atoms, the concept of a "periodic table" of particles has emerged and continues to be expanded upon. Complementing the natural intellectual curiosity that drives the creation of increasingly intricate particles is the pull from applications that take advantage of such high-value materials. Complex particles are now being used in fields ranging from diagnostics and catalysis to self-assembly and rheology, where material composition and microstructure are closely linked with particle function. This is especially true of polymer hydrogels, which offer an attractive and broad class of base materials for synthesis. Lithography affords the ability to engineer particle properties a priori and leads to the production of homogenous ensembles of particles. This review summarizes recent advances in synthesizing hydrogel microparticles using lithographic processes and highlight a number of emerging applications. We discuss advantages and limitations of current strategies, and conclude with an outlook on future trends in the field.

  • Lipoproteins: When size really matters.
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2006-06-01
    J Bruce German,Jennifer T Smilowitz,Angela M Zivkovic

    The field of nanoscience is extending the applications of physics, chemistry and biology into previously unapproached infinitesimal length scales. Understanding the behavior and manipulating the positions and properties of single atoms and molecules hold great potential to improve areas of science as disparate as medicine and computation, and communication and orbiting satellites. Yet, in the race to develop novel, previously unavailable nanoparticles, there is an opportunity for scientists in this field to digress and to apply their growing understanding of nanoscience and the tools of nanotechnology to one of the most pressing problems in all of human biology-diseases related to lipoproteins. Although not appreciated outside the field of lipoprotein biology, variations in the compositions, structures and properties of these nanoscale-sized, blood-borne particles are responsible for most of the variations in health, morbidity and mortality in the Western world. If the lipoproteins could be understood at the nanometer length scale with precise details of their structures and functions, scientists could understand a wide range of perplexing physiological processes and also address the dysfunctions in normal lipoprotein biology that lead to such diseases as hypercholesterolemia, heart disease, stroke and neurodegenerative diseases. Furthermore, if the capabilities of nanoscience to assemble and manipulate nanometer-sized particles could be recruited to studies of lipoproteins, these biological particles would provide a new dimension to therapeutic agents, and these natural particles could be designed to carry out many specialized beneficial tasks.

  • Surface-Mediated Delivery of DNA: Cationic Polymers Take Charge.
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2009-12-04
    Christopher M Jewell,David M Lynn

    The last several years have seen a significant increase in the number of reports describing the use of cationic polymers to design new materials and nanoscale assemblies that promote the surface-mediated delivery of DNA to cells and tissues. In general, these approaches fall into one of two broad categories: (i) methods based upon the physical adsorption of preformed, colloidal aggregates of cationic polymer and DNA (polyplexes) to surfaces, and (ii) methods for the layer-by-layer adsorption of DNA and cationic polymers on surfaces to fabricate multilayered thin films that provide control over the release of DNA into solution or to cells. In this Opinion, we discuss several recent examples of each of these approaches and provide commentary on ways in which the physical and chemical behaviours of cationic polymers have played key roles and present future opportunities to develop new methods for localized and surface-mediated cell transfection in vitro and in vivo.

  • AFM of biological complexes: what can we learn?
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2009-10-06
    Maria Gaczynska,Pawel A Osmulski

    The term "biological complexes" broadly encompasses particles as diverse as multisubunit enzymes, viral capsids, transport cages, molecular nets, ribosomes, nucleosomes, biological membrane components and amyloids. The complexes represent a broad range of stability and composition. Atomic force microscopy offers a wealth of structural and functional data about such assemblies. For this review, we choose to comment on the significance of AFM to study various aspects of biology of selected nonmembrane protein assemblies. Such particles are large enough to reveal many structural details under the AFM probe. Importantly, the specific advantages of the method allow for gathering dynamic information about their formation, stability or allosteric structural changes critical for their function. Some of them have already found their way to nanomedical or nanotechnological applications. Here we present examples of studies where the AFM provided pioneering information about the biology of complexes, and examples of studies where the simplicity of the method is used toward the development of potential diagnostic applications.

  • COCIS: Markov processes in single molecule fluorescence.
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2007-12-01
    David S Talaga

    This article examines the current status of Markov processes in single molecule fluorescence. For molecular dynamics to be described by a Markov process, the Markov process must include all states involved in the dynamics and the FPT distributions out of those states must be describable by a simple exponential law. The observation of non-exponential first-passage time distributions or other evidence of non-Markovian dynamics is common in single molecule studies and offers an opportunity to expand the Markov model to include new dynamics or states that improve understanding of the system.

  • Inorganic Nanoparticles for Therapeutic Delivery: Trials, Tribulations and Promise.
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2014-06-24
    Gulen Yesilbag Tonga,Daniel F Moyano,Chang Soo Kim,Vincent M Rotello

    Inorganic nanomaterials have a wide array of physical and structural properties that make them attractive candidates for imaging and therapeutic delivery. Nanoparticle platforms have been intensely studied for these applications, and examples are starting to enter the clinic. This review looks at why inorganic particles provide promising platforms for biomedicine, and what issues need to be addressed for them to reach their potential.

  • Model cell membranes: Techniques to form complex biomimetic supported lipid bilayers via vesicle fusion.
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2013-09-14
    Gregory J Hardy,Rahul Nayak,Stefan Zauscher

    Vesicle fusion has long provided an easy and reliable method to form supported lipid bilayers (SLBs) from simple, zwitterionic vesicles on siliceous substrates. However, for complex compositions, such as vesicles with high cholesterol content and multiple lipid types, the energy barrier for the vesicle-to-bilayer transition is increased or the required vesicle-vesicle and vesicle-substrate interactions are insufficient for vesicle fusion. Thus, for vesicle compositions that more accurately mimic native membranes, vesicle fusion often fails to form SLBs. In this paper, we review three approaches to overcome these barriers to form complex, biomimetic SLBs via vesicle fusion: (i) optimization of experimental conditions (e.g., temperature, buffer ionic strength, osmotic stress, cation valency, and buffer pH), (ii) α-helical (AH) peptide-induced vesicle fusion, and (iii) bilayer edge-induced vesicle fusion. AH peptide-induced vesicle fusion can form complex SLBs on multiple substrate types without the use of additional equipment. Bilayer edge-induced vesicle fusion uses microfluidics to form SLBs from vesicles with complex composition, including vesicles derived from native cell membranes. Collectively, this review introduces vesicle fusion techniques that can be generalized for many biomimetic vesicle compositions and many substrate types, and thus will aid efforts to reliably create complex SLB platforms on a range of substrates.

  • Advances in cryogenic transmission electron microscopy for the characterization of dynamic self-assembling nanostructures.
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2012-12-04
    Christina J Newcomb,Tyson J Moyer,Sungsoo S Lee,Samuel I Stupp

    Elucidating the structural information of nanoscale materials in their solvent-exposed state is crucial, as a result, cryogenic transmission electron microscopy (cryo-TEM) has become an increasingly popular technique in the materials science, chemistry, and biology communities. Cryo-TEM provides a method to directly visualize the specimen structure in a solution-state through a thin film of vitrified solvent. This technique complements X-ray, neutron, and light scattering methods that probe the statistical average of all species present; furthermore, cryo-TEM can be used to observe changes in structure over time. In the area of self-assembly, this tool has been particularly powerful for the characterization of natural and synthetic small molecule assemblies, as well as hybrid organic-inorganic composites. In this review, we discuss recent advances in cryogenic TEM in the context of self-assembling systems with emphasis on characterization of transitions observed in response to external stimuli.

  • Self-organization of Nucleic Acids in Lipid Constructs.
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2017-05-13
    Minjee Kang,Hojun Kim,Cecilia Leal

    Lipids and nucleic acids (NAs) can hierarchically self-organize into a variety of nanostructures of increasingly complex geometries such as the 1D lamellar, 2D hexagonal, and 3D bicontinuous cubic phases. The diversity and complexity of those lipid-NA assemblies are interesting from a fundamental perspective as well as being relevant to the performance in gene delivery and gene silencing applications. The finding that not only the chemical make of the lipid-NA constructs, but their actual supramolecular organization, affects their gene transfection and silencing efficiencies has inspired physicists, chemists, and engineers to this field of research. At the moment it remains an open question how exactly the different lipid-NA structures interact with cells and organelles in order to output an optimal response. This article reviews our current understanding of the structures of different lipid-NA complexes and the corresponding cellular interaction mechanisms. The recent advances in designing optimal lipid-based NA carriers will be introduced with an emphasis on the structure-function relations.

  • Capillary suspensions: Particle networks formed through the capillary force.
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2015-03-03
    Erin Koos

    The addition of small amounts of a secondary fluid to a suspension can, through the attractive capillary force, lead to particle bridging and network formation. The capillary bridging phenomenon can be used to stabilize particle suspensions and precisely tune their rheological properties. This effect can even occur when the secondary fluid wets the particles less well than the bulk fluid. These materials, so-called capillary suspensions, have been the subject of recent research studying the mechanism for network formation, the properties of these suspensions, and how the material properties can be modified. Recent work in colloidal clusters is summarized and the relationship to capillary suspensions is discussed. Capillary suspensions can also be used as a pathway for new material design and some of these applications are highlighted. Results obtained to date are summarized and central questions that remain to be answered are proposed in this review.

  • On the analysis of ionic surface conduction to unravel charging processes at macroscopic soft and hard solid-liquid interfaces
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2019-10-28
    Ralf Zimmermann, Jérôme F.L. Duval, Carsten Werner

    The electrohydrodynamics of soft interfaces and the processes underlying interfacial charge formation by e.g. unsymmetrical ion adsorption are important aspects of current research on electrosurface phenomena. In particular, the recent progress in both fields greatly benefits from the now-possible accurate evaluation and quantitative interpretation of (ionic) excess conductivities at solid surfaces and in 3D polyelectrolytic architectures, respectively. Achievements in the proper formulation of conceptual and theoretical framework and in the improvement of measurement capabilities have been tightly connected to the work of Johannes (Hans) Lyklema (1930-2017). Considering his valuable contributions, we herein summarize the theoretical basis of surface conductivity analyses, review the experimental options for the quantification of the surface conductivity at macroscopic planar solid-liquid interfaces, and discuss exemplary surface conductivity case studies for soft and hard interfaces permeable or not to ions and fluid flow. Dedication Johannes Lyklema (November 23, 1930 – October 31, 2017) was a key scientist in colloid and interface science. He completed his doctorate at the University of Utrecht in 1957 under the supervision of Prof. J. Th. G. Overbeek with a thesis entitled "Adsorption of counterions". In 1963, he was appointed Professor of Physical and Colloid Chemistry at Wageningen Agricultural College (later named Wageningen University), a position he kept until his retirement in 1995. Under his directorate, the Laboratory of Physical and Colloid Chemistry at the Wageningen University became a world-leading research center known for its key research in the fields of interfaces, macromolecules, and electrochemistry. Johannes Lyklema published almost four hundred articles and wrote the five-volume text book ‘Fundamentals of Interface and Colloid Science’, he gave lectures in five languages and on five continents, received honorary doctorates in Belgium, Sweden and Spain, and has been awarded with the Order of the Dutch Lion, to quote only a few of the distinctions and awards he received during his career. In his research, Johannes Lyklema paid particular attention to the analysis and interpretation of electrosurface phenomena. He was founder and chairman of the International Advisory Board of the conference series Electrokinetic Phenomena (ELKIN) and section editor on electrokinetics in this journal (Current Opinion in Colloid and Interface Science). We will remember Johannes Lyklema as an eminent scientist as well as a warm-hearted and outstanding person.

  • 更新日期:2019-10-19
  • Boundary layers and surface forces in pure non-aqueous liquids
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2019-10-15
    Ludmila B. Boinovich

    Further progress has taken place in the experimental studies and molecular simulations of the structure and properties of boundary layers and thin interlayers of pure nonaqueous liquids. Recent findings in the field, including a deviation of density and shear response, layering, static and dynamic structuring upon interlayer thinning are discussed in the context of the surface forces and the disjoining pressure contribution to the liquid film stability.

  • Capsules from Pickering emulsion templates
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2019-10-15
    Ana Maria Bago Rodriguez, Bernard P. Binks

    Following the resurgence of interest in particle-stabilised or Pickering emulsions recently, the preparation of capsules from such templates has become feasible. We review some of the recent activity in this area and focus on both the methods used to reinforce the particle shell and the applications of these novel capsules, which may be empty or liquid-filled. The methods reported include interfacial polymerisation or crystallisation, interfacial cross-linking, the use of a sacrificial template, formation of polymer layers, gelation and evaporation from multiple emulsions. Potential applications are in the areas of wastewater treatment, perfume encapsulation, drug/dye release and as self-healing coatings.

  • 更新日期:2019-10-15
  • Enzyme encapsulation in nanostructured self-assembled structures - towards biofunctional supramolecular assemblies
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2019-10-11
    Maria Valldeperas, Andrea Salis, Justas Barauskas, Fredrik Tiberg, Thomas Arnebrant, Valdemaras Razumas, Maura Monduzzi, Tommy Nylander
  • Electrical double layers as ion reservoirs. Applications to the deionization of solutions
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2019-10-09
    A.V. Delgado, M.L. Jiménez, G.R. Iglesias, S. Ahualli

    In this work, we briefly review the basics of the structure of the electrical double layer (EDL), with emphasis on the amount of neutral salt that can be accumulated in the EDLs of opposite electrodes when a potential difference is applied. Consideration is taken of the realistic solution taking into account that ions have finite volumes and have a limited concentration at any point, as well as to the effect of ion charge. As a result of this accumulation, ionic solutions in contact with the electrodes can be partially deionized, and brine water can eventually transform into potable one. The technology has been denominated CDI or Capacitive DeIonization, as it is based on the high electrical capacitance that can be associated to the EDLs. We give a brief account of how CDI can be implemented and the achievements that can be reached taking into account the EDL structure. Variations such as MCDI (membrane-CDI) or SE-CDI (soft electrodes CDI) are also described. The advantages of capacitive deionization regarding specific ions withdrawal from solutions, as well as the energy requirements for deionization are also discussed.

  • Surface phase transitions in foams and emulsions
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2019-10-02
    Nikolai Denkov, Slavka Tcholakova, Diana Cholakova
  • Coalescence in foams and emulsions: similarities and differences
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2019-09-28
    Dominique Langevin

    Coalescence in emulsions and foams is far from being understood, despite of many years of investigations. The phenomenon is not easy to characterize because it is extremely rapid and coupled to several others, gravity effects, leading to vertical motion of drops/bubbles and ripening, leading to their growth. Coalescence implies the rupture of films between drops/bubbles and involves contributions from hydrodynamics, surface rheology, surface forces and thermal fluctuations. Different coalescence scenarios were identified and are described. There are close similarities between emulsions and foams behavior, as remarked early by several researchers. Ivan Ivanov, to whom this paper is dedicated, was one of them. He and his group pioneered parallel studies in both emulsions and foams, aiming to clarify coalescence mechanisms. As discussed in this review, such an approach proved very successful and deserves to be continued in the future.

  • Recent advances in studies of bubble-solid interactions and wetting film stability
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2019-09-28
    Marta Krasowska, Kazimierz Malysa, David A. Beattie
  • 更新日期:2019-09-11
  • 更新日期:2019-09-10
  • Recent Advances in Short Peptide Self-assembly: from Rational Design to Novel Applications
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2019-09-03
    Xuzhi Hu, Mingrui Liao, Haoning Gong, Lin Zhang, Henry Cox, Thomas A. Waigh, Jian R. Lu
  • 更新日期:2019-08-20
  • Poiseuille and Extensional FlowSAS for Developing Structure-Rheology Relationships in Soft Matter Systems
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2019-08-08
    Avanish Bharati, Steven D. Hudson, Katie M. Weigandt

    As the rheoscattering community has grown, so have the breadth of experiments both in terms of materials systems, and also in terms of flow types and analysis approaches. In this review, we seek to highlight important recent developments in rheoscattering that go beyond simple shear measurements. In particular this review will focus on Poiseuille flow and extensional flow small angle scattering and results from recent experiments that lead to the development of structure-function relationships in a wide variety of soft materials.

  • 更新日期:2019-08-07
  • 3D-printed glass microfluidics for fluid dynamics and rheology
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2018-12-22
    Noa Burshtein, San To Chan, Kazumi Toda-Peters, Amy Q. Shen, Simon J. Haward
  • Time-dependent yield stress materials
    Curr. Opin. Colloid Interface Sci. (IF 6.271) Pub Date : 2019-02-07
    Paulo R. de Souza Mendes, Roney L. Thompson
  • 更新日期:2019-07-05
  • 更新日期:2019-07-05
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上海纽约大学William Glover